(04-22) 14:52 PDT LAS VEGAS, CA (AP) --
U.S. Sen. John Ensign's decision this week to resign marked a mysterious change of heart for the Nevada Republican, raising questions about what an ongoing Senate ethics probe has uncovered while also muddling the field of candidates for congressional seats now held by the GOP headed into a key election year.
Leaders of the Senate Ethics Committee noted tersely Friday that Ensign made the proper decision in turning in a letter of resignation amid their unrelenting, but as yet unfinished, two-year probe of his conduct.
Ensign, 53, cited "wear and tear" on himself and his family in his announcement Thursday, which came nearly two years after he acknowledged having had an extramarital affair with a former staffer. He was accused of helping the woman's husband — a top former Ensign staffer — obtain lobbying work.
Ensign's pending departure also casts a new sense of urgency over Nevada's closely watched Senate race to replace him. After he announced last month that he would not seek re-election, Democrats hoped to claim the seat to protect their fragile Senate majority.
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http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2011/04/21/state/n155615D65.DTL